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Role of lattice distortion on diffuse phase transition temperatures in Bi0.5Na0.5TiO3-BaTiO3 [BNBTO] solid solutions.
- Source :
- AIP Conference Proceedings; 2018, Vol. 1942 Issue 1, p1-1, 1p, 1 Chart, 6 Graphs, 1 Map
- Publication Year :
- 2018
-
Abstract
- Effect of lattice distortion on diffuse phase transition in BNBTO solid solutions near Morphotropic phase boundary (MPB) has been investigated. Solid solutions of (Bi<subscript>0.5</subscript>Na<subscript>0.5</subscript>)<subscript>1−x</subscript>Ba<subscript>x</subscript>TiO<subscript>3</subscript> (with mole % of x= 0.04, 0.05, 0.06, 0.07 and 0.08) were prepared by the planetary ball mill method in ethanol medium. Rietveld refinement technique with rhombohedral (<italic>R3c</italic>) and tetragonal (<italic>P4bm</italic>) crystal symmetry has been employed for structural as well as phase analysis of the solid solutions. Both rhombohedral and tetragonal lattice distortion (c/a) tends toward the pseudo-cubic crystal symmetry with the increase of mole fraction of Ba<superscript>2+</superscript> near MPB (x= 6 mole %). Also, the average crystallite size and grain size decrease with increase of mole fraction of Ba<superscript>2+</superscript> in BNT ceramic are due to larger ionic radius of Ba<superscript>2+</superscript> and grain boundary pinning process in the solid solutions respectively. Additionally, depolarization temperature (<italic>T</italic><subscript><italic>d</italic></subscript>) and maximum temperature (<italic>T</italic><subscript><italic>m</italic></subscript>) reduces due to the lattice distortion of both the phases in BNBTO solid solutions, which is explained extensively. Significant increase of dielectric constant has been observed near MPB composition (x=6%) in BNBTO solid solutions. [ABSTRACT FROM AUTHOR]
- Subjects :
- PHASE transitions
SOLID solutions
RIETVELD refinement
BALL mills
CRYSTAL symmetry
Subjects
Details
- Language :
- English
- ISSN :
- 0094243X
- Volume :
- 1942
- Issue :
- 1
- Database :
- Complementary Index
- Journal :
- AIP Conference Proceedings
- Publication Type :
- Conference
- Accession number :
- 129032272
- Full Text :
- https://doi.org/10.1063/1.5028599